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RhinoScript – 3d coordinate of point

pay attention to the difference between a 3d point (i.e. coordinates) and a point object reference (i.e. an ID referencing a point object in the model). ObjectyByType gives you references. Use PointCoordinates to get the point coordinates.
Another thing: arrObjects is an array of object references. You have to loop through the items drawing a circle for each individually.